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TPS63020-Q1 Datasheet(PDF) 10 Page - Texas Instruments

No. de pieza TPS63020-Q1
Descripción Electrónicos  TPS63020-Q1 High Efficiency Single Inductor Buck-Boost Converter With 4-A Switches
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TPS63020-Q1
SLVSD52 – OCTOBER 2015
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Device Functional Modes (continued)
Figure 2. Average Current Mode Control
9.4.4 Power Save Mode and Synchronization
The PS/SYNC pin can be used to select different operation modes. Power save mode is used to improve
efficiency at light load. To enable power-save, PS/SYNC must be set low. If PS/SYNC is set low then power save
mode is entered when the average inductor current gets lower then about 100 mA. At this point the converter
operates with reduced switching frequency and with a minimum quiescent current to maintain high efficiency.
During the power save mode, the output voltage is monitored with a comparator by the threshold comp low and
comp high. When the device enters power save mode, the converter stops operating and the output voltage
drops. The slope of the output voltage depends on the load and the value of output capacitance. As the output
voltage falls below the comp low threshold set to 2.5% typical above VOUT, the device ramps up the output
voltage again, by starting operation using a programmed average inductor current higher than required by the
current load condition. Operation can last one or several pulses. The converter continues these pulses until the
comp high threshold, set to typically 3.5% above VOUT nominal, is reached and the average inductance current
gets lower than about 100 mA. When the load increases above the minimum forced inductor current of about 100
mA, the device will automatically switch to PWM mode.
The power save mode can be disabled by programming high at the PS/SYNC. Connecting a clock signal at
PS/SYNC forces the device to synchronize to the connected clock frequency.
Synchronization is done by a PLL, so synchronizing to lower and higher frequencies compared to the internal
clock works without any issues. The PLL can also tolerate missing clock pulses without the converter
malfunctioning. The PS/SYNC input supports standard logic thresholds.
10
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